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On average, symptoms from E. coli O157:H7 infection develop within 3 to 4 days of eating contaminated food, with a range of 1 to 10 days. Symptoms usually include severe bloody diarrhea and abdominal cramps; sometimes the infection causes non-bloody diarrhea or no symptoms.
Some bugs, such as the type you might get from a picnic salad or sandwich spread that sat out for too long, can produce symptoms within a few hours. Salmonella, most commonly found in undercooked poultry and eggs, might take 12 to 24 hours to cause trouble. E. coli, on the other hand, which is often spread via uncooked vegetables, can take several days to incubate before illness sets in.